A riot is a form of civil disorder characterized by disorganized groups lashing out in a sudden and intense rash of violence against people and/or property. While individuals may attempt to lead or control a riot, riots are typically chaotic and exhibit herd behavior. Riots often occur in reaction to a perceived grievance or out of dissent. They typically involve vandalism and the destruction of private and public property. The specific people/property to be targeted varies depending on the cause of the riot and the inclinations of those involved.